In graphite, each carbon atom is covalently bonded to the other three carbon atoms.

Give a reason for the following:

Graphite is used as a lubricant.

Give two examples of allotropic forms of carbon.

Give reason for the following:

Diamond is used as a gem in jewellery.

Circle the odd one and give reason for your choice.

 Diamond, charcoal, graphite, marble

Which are the crystalline forms of carbon? State any two of their properties.

Write the uses of diamond.

Circle the odd one and give reason for your choice.

Coke, charcoal, coal tar, liquid ammonia.